Real-time Improvement of Audio Signals in Underwater Communication (de)

* Presenting author
Day / Time: 08.03.2023, 15:20-15:40
Room: Saal X 3-4
Typ: Vortrag (strukturierte Sitzung)
Abstract: In this work, we implement speech signal enhancements in the context of underwater telephony. The system mostly addresses issues of the “dry end”, covering acoustic echoes, local stationary noise, and gain fluctuations. It consists of a linear acoustic echo canceller with a sophisticated timevariant and nonlinear control strategy, a postfilter for suppressing noise and residual echoes, and both automatic and noise-dependent gain control algorithms. The system relies on estimations of noise spectra, coupling factors, and delays as well as voice activity detections for different signals. The acoustic echo canceller includes a detector for room changes for quick adaptation and recovery from errors. It was tested successfully with both regular and underwater transmission channels, in conversational and simulated setups, and shown to significantly improve the speech quality in conversations.


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